I don't know anything about the new fangled machines
One tip I heard recently is if you don't like the throat space for FMQ on the machine you have, turn it 90 degrees.
Face the nose of the machine. Voila - "infinite" throat space.
Obviously this doesn't work for machines built into tables unless you want to lay like you're Superman, but maybe it gives you some ideas? This is really just like having it on a frame, with no frame.
Maybe since you did well with the Kennie but wanted more space you could use the Janome for everything else, and keep going with the Kennie for FMQ.